Writing instrument



FIG. 1 is a front elevational view of a writing instrument in an exploded condition;

FIG. 2 is a rear elevational view of FIG. 1;

FIG. 3 is a right side elevational view of FIG. 1;

FIG. 4 is a left side elevational view of FIG. 1;

FIG. 5 is a front elevational view of the writing instrument with the cap member in place;

FIG. 6 is a rear elevational view of FIG. 5;

FIG. 7 is a right side elevational view of FIG. 5; and,

FIG. 8 is a left side elevational view of FIG. 5. 

The ornamental design for a writing instrument, as shown and described. 